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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '671e41da047d42314e363e6a288dc0ed1e55ed095468856ca997d8f92489dbd5' 
  AND token = '4sJGgsqI43eMiIhPLlGvFrUvyQf7JyOskl0Unl6b1xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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