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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8126af1fe3780f2d93ea75b0691acef4d469e9c80a31c825a58deb540ce2227' 
  AND token = 'wxC16yNmVU2PkMkL0m5mkHd3TOkmb8g4zPZpZOD3J6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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