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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f810067728a250d45330a4302b7bf501544dcdf585db5c9de9242e64a099c9e' 
  AND token = '3QPoUIcahmneIWrD3lCICFKbAUtysVwW7kFkIM/Vjzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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