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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f80f045fe87def07e292b219eb5f6ae8356cd0960e11734bf1c15ae4d5ff1e' 
  AND token = 'LYNWlucM5+a2eaGjugY7A/PVUFiiK9m0tA2pXdcdpis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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