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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f700a64e2e8354b8bb062bdfd56dac6b6540cede86f400e7164bc57d4cbe0147' 
  AND token = '1Bbw06KSraHwb9Ctl1wTn4VIbkcOFQqUENmFnywQWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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