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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '876bc97d459b13a77ce5e60dec6ec24d9c2c66200992c5695cf9960f65f5cb0f' 
  AND token = 'L4d/4Ce4aDxuAxtpQwHS725ywpajqY4sBM/EFJqVUEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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