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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eeec5ae2cb9a036d09bb3596772944e89e8d61d3f7a8e5a4d3f40a02d468f6c' 
  AND token = '2Zj82oNHU/uHyYdk7L5RjIQr+rNSnFPEW3Ye9jDb+lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}