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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77d8129d07d51bdc48e82fe01b1221626f7eb8a2654489a8a46cead3a9851415' 
  AND token = 'F6flD75UGAtTm0/MYXA/m1QMH6HMkxuhhy1JKQpormc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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