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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a876331f8a307f621842b31a8825dcce49c74bd575e05beece225ce0e0049b15' 
  AND token = 'ZnuQwHSHWsapAG0I+lxorEtEsYm+KIQ/5O174NKvht8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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