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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24afdde914ecca6787a4360bc180be45ab6d1a336260d54c88c1551e2eba5888' 
  AND token = 'nxuFcSrNtEqjAVXBX55CPT9ii8i0/J+acoJY+Ua8Dg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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