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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cb3a070903fd40d975d242057c952d94bc933a009a7db53507a846245618014' 
  AND token = 'UtplsHl5BL6HkF/qVEWrD/UnwwJTx1aUgOAMflX3z5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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