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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '267e3fbc99b835576920a0d4952f0e2b1e9ff71a263b9464f96f28d9d6a02d66' 
  AND token = 'zlt+BunyNDb3E+udE8c9ZCwvti9Kk+IoPs2WstE1EgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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