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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31ef335fcd04f5dc60c2c78674cb28de6e2e825e09a790bf7c65fc2216211525' 
  AND token = 'Nsd0QBNz8nRy/B/LAJRz7BxatMLVhpXf3OtncBpTBow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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