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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e76854c0b0c0366d7903d2819d7bb958e2804b77b42ff9a0451ec38b75dfea5' 
  AND token = '3o2BAf1wr8LaXjnzPG5vA8L0loxoXy8QCC97d8ZWpVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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