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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15d548af7ecc0af46a9750d026910e48cd823eab557051029ce4d036432fa794' 
  AND token = '36RcfBB9rSzr1jtlOJAib+C2iEC6N59661UKBjJg408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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