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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '738eb82c5a705ab2b34b28ad8a6686ba72aa7c0399d29f4c663f76ad78960543' 
  AND token = '93fevMfTucCrWtE8KQB+mioRAMy1Trc1Lk43SWKadeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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