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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cc739c07822c5fbf951c63d397c42623f840f87664bb1f5dd1a927f363f6e7' 
  AND token = 'zkD+JtSIP8kQP1M7aUg7uamKDy6DlY+/eAkfMRzu6lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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