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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbcd7c4ec2d26ebd7a106e50bff4d6ef476387dbae09ebb311d65386adc5d158' 
  AND token = 'l9XH5ERJNCygBg9u29LVHSdG/Px4xGpfG2EcLhwE/0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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