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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c8ea18d354bdf3a3e0aa2abe926919af1f1e61e9a307dbc3644eb0a4ab845d' 
  AND token = 't5/EVC+q/tSuxz9Ae/LtUZMyRWDcl2AD64r3TinSB1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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