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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f972db8789716be188d180fae8015178e1d76589cd40b56792684dad1881668' 
  AND token = 'gMi92bReaV/iTfvy4/TNiuvm6mygxTNNQj0xswCCi10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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