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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f05e3cf38266a6f0812ba7713f8483f06c54f7e2c317302872aeca40e82f36c' 
  AND token = 'ESGpA7FynvjlRXuAAWhqtR36dy6YBxFUOb+k9BOHo2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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