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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '699d35bb1ed03b69c2eab388d58c2a5b82e76ad0dbeb0fe7421b0714c4922f0a' 
  AND token = 'qN+NdCeD6L7JAsJ+19cff1MpR7U4c0fcVIB6Xk2pQdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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