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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0f72380a560d680d0c575c0895eb788e4e93c29aa75ef2e4d123d6dfaa1775d' 
  AND token = 'Uawoi4RRwjMCEY1dJMW7uGVjDWuEeeyS0vqgo+95FPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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