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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b34a5633a68520e5d3877aaa0ba4eb17b3d723d595c90a095d1f8bd491f0897' 
  AND token = 'FhM/o5YC+c/diy7hpatKvJCOy480B+y9cL14ritTqew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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