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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27f651037f153787e1b19a7c1ee76a7762d13e0be8c94da8d3742cbcf0ee7936' 
  AND token = '/kBIS3wdHw853ol2M+4r0CCQAC7rKxzBScS0uDEpHdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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