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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eef840292b4c634698af79864b0b852f5ff544cae8106b1798374d4dc051bf5' 
  AND token = 'p69OE4bFfwuOiaKecAthR1MMQm4EQ2fvB1a5Tqlu3xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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