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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e877a72bbd9a08a26e5f0172d40eb98611090fff396a4984352d52026095de' 
  AND token = 'FpBttq6v0eUC3TCAu4OVxbilpivtDqncCYuwE7BAyMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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