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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b93ffcc10d94601a5d7f904dab8832b7f4b68d123c69c4c4918421e1cdf3f93' 
  AND token = 'qtvCL0TvmMcOA8j4aTPFoGAXJhnxVKcuSXy9ycQ6Co4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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