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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c667008c9014551ae1696af9550ca94369fcc6cd8455bce0cd64962dc341363' 
  AND token = 'y5xNf3rkw6bPZHRFG94+NnWsiV/pw+s6dXHN2MsgPco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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