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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785fc621cd436797abd7afcc52a4a00158bc8cbf94c54ecbaa6ebf85f604a1d1' 
  AND token = 'V7WJ26S87v9/tUt3OA/O4SlvuF5kMwvbHb8ZIG6c1PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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