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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b663fee600008a97246a90bd4f7e801e3f031f7786ff27a342cf46c0e087a69c' 
  AND token = 'jS2SYM2TZ6867sRKD9Y5cgkPUtntQ1QHASBxnn7pAUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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