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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a66c97abed292359ea25dccf59fe341302e6b623ad54146cededc5f820b5506' 
  AND token = 'xUyiLVtlWWI2dLoE34uVmKHAv4SU7GBMpfIWFnUjiNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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