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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfc266c73835952626f8635f8486792f3c006f65b12d6385c825ec010654385f' 
  AND token = 'Q7i0DvHQM1+8HatVMfcq//heYl2/5/+hcjvKLsC3/nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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