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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '681ced871b0e6a048031e4854feb50e0ecc3e78bfc2c8f7447fa00c7d236a07c' 
  AND token = 'b/Y+LEy4P59P7K+j7aATOOD3enTWEedzAiiJdnv+RaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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