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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1244b2aabac81ed6d7b0fd85cbf66f7aad65d77f24c17f10809c4c998398579' 
  AND token = 'H6pBWViyVx8dRbA3GyOppcvNnQjb00gyFG4I33iEk+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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