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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a924f332dc8143d7917980cb2459dbb30cc184e068101fdb9964bb454d1eaaa0' 
  AND token = 'DgfJ7+g1Z0NUS/L6pQf8Is3L11L4nON3B4fl3vo6Zy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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