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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab2c37181779d3025762f1738c0e1f429d558fce89037780abed5526339e923' 
  AND token = '8XfiLwLfccQ7BDVeTG0cQqGpAr8oxVdWVL5phMBQHF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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