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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a295618613ef057419da4586707b45bb1b946da3e08d42c4ad29965e6e9a4354' 
  AND token = 'lxodl7G/s2EYNVQryoLewl8zcVUwMV0nAT5eWYnnBw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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