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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0494d76117890925a344548f6420a0b82b2d19aca550a1ad4f155c9f3e51dffb' 
  AND token = 'ZkW9vMxV8tWCc/tN4QHLzmXeNZEMk1oGNID0vRXn650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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