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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc1a5ddba55b4c93b30c4210629d4124c8a1d2d5df6cd0faf8aa20548096e82' 
  AND token = 'Acif8J7IETYO+2L5+eeTQD9gSm5CHIEOhE9QD4zvoNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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