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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52c4cce13fe9a322478e248bd8731b40df836acbb274bef417e5700e05e02f2b' 
  AND token = '3+4Ecnbdslg3kRWBjFHi/ZaVPABavi0QTj3GmWrUV1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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