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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d90f44f361958ab2f5af179f6abefdc2e248fb628dc22a13f7b31b56e3af317' 
  AND token = 'fy0qn4QjoKbrMoPgBW4BQDqZl7C6GNPALrLEKprle2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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